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The purpose of this study is to propose a numerical simulation method for estimating the effect of micro-structural characteristics of two-phase steel on ductile crack growth resistance (R-curve) of structural components. For this purpose, a hierarchical approach is proposed to correlate the micro-structural characteristics with the R-curve, which consists of a meso-scopic approach and a macro-scopic approach. A meso-scopic approach correlates the micro-structural characteristics with the two types of ductile properties of steel that controls R-curve. Then, a macro-scopic approach predicts R-curve from the two types of ductile properties obtained by the proposed meso-scopic approach. It is demonstrated that the proposed hierarchical approach can predict R-curve of a 3-point bend specimen with a crack from micro-structural characteristics of two-phase steel

Simulation Model to Correlate Micro-structural Characteristics of Two-phase Steel with Ductile Crack Growth Resistance